vanadium has a radius of 135 pm and crystallizes in a body-centered cubic structure. what is the edge length of the unit cell?

The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.

Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.

These factors contributed to the polar air mass:

During the colder months of the year, continental polar air typically forms over vast land masses.

A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.

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Answer:

The new temperature is 200 K.

Explanation:

Charles law gives the relationship between temperature and volume of a gas. It states that volume is directly proportional to temperature such that,

\(V\propto T\\\\\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\)

We have,

\(T_1=100\ K\\\\V_1=500\ mL\\\\V_2=1000\ mL\\\\T_2=?\)

Plugging all the values,

\(T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1000\times 100}{500}\\\\T_2=200\ K\)

So, the new temperature is 200 K.

The number of calories required for 47.5g of Al to go from 25 to 62 is 3,689.9 cal.

Calories are a measure of energy. They are the amount of energy that is released when food is digested, broken down and converted into energy for the body to use. The energy from calories is used to fuel physical activities, as well as all the bodily functions that keep us alive. Eating food is the main source of calories, although some drinks also contain calories. Different types of food contain different amounts of calories. Foods that are high in fat and sugar tend to contain more calories.

Calories (cal) = Heat (J) / 4.184
Heat (J) = Mass (g) x Specific Heat (J/g C) x Change in Temperature (C)
Heat (J) = 47.5g x 0.900 J/g C x (62 - 25) C
Heat (J) = 15,495 J
Calories (cal) = 15,495 J / 4.184
Calories (cal) = 3,689.9 cal.

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Answer:

The metals in this group are lithium, sodium, potassium, rubidium, cesium, and francium. The gas hydrogen is also put in this group because it shares similar reactivity with the alkali metals.

I don't know if this is what you wanted or not sorry if it isn't

Answer:

A) a pure substance

Explanation:

Everything in the universe is made from elements. An element has unique number of protons and electrons. Due to the number of neutrons present in the nucleus, an element can be either stable or radioactive. In other words we can say an element has one type of atoms. C,H,O,N and P can be taken as examples for elements.

Hope this helps! Have a great day!

Answer:

uhh i learned thisin like 6th grade, its A.)

Explanation:

<3 i did not look at the other persons answer i swear U-U

Answer:

Explanation:

Isotope notation is of the form

A

Z

X

where  

Z

is the atomic number (number of protons),  

A

is the mass number (sum of protons and neutrons), and   X   is the element.

In Carbon- 14 ,   14  is the mass number (sum of protons and neutrons). This is our  A .

Carbon has the atomic symbol   C , and it has  6 protons. This is the atomic number, or  A . Thus, the isotope notation for Carbon- 14  is  14  6  C

Hope this helps!

Explanation:

Answer:

In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.

In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.

A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.

Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.

A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.

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Answer:

1) 40

2) 2.25 moles

3) 17

4) 120

5) Fe₂O₃

Explanation:

Please see attached picture for full solution.

Answer:

1) \(\boxed{Molar \ mass = 40\ g/mol}\)

2) \(\boxed{No.\ of\ Moles = 1.61 \ moles}\)

3) \(\boxed{Ammonia = 16\ g/mol}\)

4) \(\boxed{Sodium\ Hydrogen\ Sulphate= 120 \ g/mol}\)

5) \(\boxed{Fe_{2}O_{3}}\)

Explanation:

Question # 1:

Using Formula, No. of moles = Mass in grams / molar mass

Where moles = 0.375 mol. , mass = 15 g

=> Molar Mass = Mass in grams / No. of moles

=> Molar Mass = 15 / 0.375

=> Molar mass = 40 g/mol

Question # 2:

No. of moles = Mass in grams / Molar mass

Where Mass = 90 g ,

=> Molar Mass = \(MgO_{2}\)

=> MM = 24 + (16*2)

=> MM = 24 + 32

=> MM = 56 g/mol

No. of Moles = 90 / 56

No. of Moles = 1.61 moles

Question # 3:

Ammonia => \(NH_{3}\)

N has atomic mass 14 ang H has atomic mass 1

Ammonia = (14)+(1*2)

Ammonia = 14+2

Ammonia = 16 g/mol

Question # 4:

Sodium Hydrogen Sulphate => \(NaHSO_{4}\)

Where Na has atomic mass 23, H has atomic mass 1 , sulpher 32 and oxygen 16

\(NaHSO_{4}\) = 23+1+32+(16*4)

=> 56+64

=> 120 g/mol

Question # 5:

The metal which has relative atomic mass of 56 is Iron (Fe)

Given that the oxide contains 70.0 % of Metal

Mass of \(MO_{x}\) (Metal oxide) = 56 / 70 * 100

Mass of \(MO_{x}\) (Metal oxide)  = 0.8 * 100

Mass of \(MO_{x}\) (Metal oxide)  = 80

Mass of x O's = 80 - 56

Mass of x O's = 24

Now, Mass of O = 24 / 16

Mass of O = 1.5

So, Fe Metal and its oxide are in the ratio of

1 : 1.5

×2   ×2

2 : 3

So, the empirical formula of metal with its oxide is \(Fe_{2}O_{3}\)

Answer:

Because of the earths rotation

Explanation:

But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.

Answer:

When the earth is rotating, it is rotating away and towards the sun which is why we have day and night

Explanation:

Answer:

Explanation:

D. i had this on my science test!!!

Answer:

D

Explanation:

yup its D

The amino acid residue that allows glutathione to reduce reactive oxygen species is c. cysteine.

Cysteine is a non-essential amino acid important for making protein, and for other metabolic functions. It's found in beta-keratin. This is the main protein in nails, skin, and hair. Cysteine is important for making collagen. It affects skin elasticity and texture. Cysteine has antioxidant properties.

There may be benefits that have not yet been proven through research.

A form of cysteine called L-cysteine may help treat arthritis and hardening of the arteries. It may help treat certain lung diseases. These include bronchitis, emphysema, and tuberculosis.

Cysteine may play a role in the normal growth rate of hair. Cysteine may also help reduce the effects of aging on the skin. It may help healing after surgery or burns and protect the skin from radiation injury.

Cysteine may help burn fat and increase muscle mass.

This amino acid contains a thiol group, which plays a crucial role in the antioxidant activity of glutathione by reducing reactive oxygen species.Hence, the correct answer is option c.cysteine

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If you add 5 ml of 0.5 M NaOH solution to 20 ml each of buffer B (with a pH of 4.03) and buffer C, the buffer whose pH will change the least is buffer B.

What is a buffer?

A buffer is a solution that resists changes in pH when acid or alkali is added. A buffer solution is a solution that contains a weak acid and its corresponding weak base or a weak base and its corresponding weak acid.

The Henderson-Hasselbalch equation can be used to calculate the pH of a buffer solution before and after adding a strong base or acid.

The equation is pH = pKa + log ([A-]/[HA])

where:pKa is the dissociation constant for the acid[A-] is the conjugate base of the acid when a command (such as NaOH) is added to a buffer solution, the base reacts with the weak acid to form the conjugate base of the acid and water. The addition of the conjugate base of the acid causes the pH of the solution to rising.

When an acid (such as HCl) is added to a buffer solution, the acid reacts with the weak base to form the conjugate acid of the base and water. The addition of the conjugate acid of the base causes the pH of the solution to decrease. Based on the above equation, pH change will be minimum in Buffer B. Therefore, the buffer whose pH will change the least is buffer B.

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Answer:

Dylan invested $ 600 in a savings account at a 1.6 % annual interest rate . He made no deposits or withdrawals on the account for 2 years. The interest was compounded annually . Find, to the nearest cent, the balance in the account after 2 years. a₁ What information from the question is important ? b . How much does Dylan have in his bank account after 2 years ? Show work .

The period of development from fertilized egg to birth is known as \({ \bf{ \underbrace{prenatal\: development}}}\).

\(\bold{ \green{ \star{ \orange{Mystique35}}}}⋆\)

Answer:

C.H2O has the highest boiling point.

I am not totally sure.

Hope it help you.

The intrinsic carrier concentration and the fraction of ionized atoms of silicon at -55℃, 0℃, 20℃, 75℃, 125℃ is calculated below.

The intrinsic carrier concentration in intrinsic material is the number of electrons found in the conduction band or holes in the valence band. This quantity of carriers is determined by the material's band gap as well as its temperature.

Because the number of holes equals the number of electrons, the concentration of each is equal to some amount, ni, and this quantity is known as the intrinsic carrier concentration, and the pure semiconductor material is referred to as intrinsic material.

Given:

B = 5.4 x \(10^{31}\)

\(E_G\) = 1.12 ev for silicon

K = 8.62 x \(10^{-5}\)

Silicon crystal = 5 x \(10^{22}\) atoms/\(cm^3\)

To find:

Intrinsic carrier concentration, ni = ?

Fraction of ionized atom = ?

Formula:

\(ni^2 = BT^3 e^{\frac{-E_G}{KT}\)

Fraction of ionized atom = ni / 5 x \(10^{22}\)

Calculations:

(a) For -55℃:

T = -55 + 273 = 218K

ni = \(5.4 * 10^{31} * 218^3 * e^{(\frac{-1.12}{8.62 * 10^{-5} * 218})}\)

ni = 2.7018 x \(10^6\) carriers/\(cm^3\)

Fraction of ionized atom = 2.7018 x \(10^6\) / 5 x \(10^{22}\)

Fraction of ionized atom = 5.403 x \(10^{-17}\) atoms/\(cm^3\)

(b) For 0℃:

T = 0 + 273 = 273K

ni = \(5.4 * 10^{31} * 273^3 * e^{(\frac{-1.12}{8.62 * 10^{-5} * 273})}\)

ni = 1.53 x \(10^9\) carriers/\(cm^3\)

Fraction of ionized atom = 1.53 x \(10^9\) / 5 x \(10^{22}\)

Fraction of ionized atom = 3.07 x \(10^{-14}\) atoms/\(cm^3\)

(c) For 20℃:

T = 20 + 273 = 293K

ni = \(5.4 * 10^{31} * 293^3 * e^{(\frac{-1.12}{8.62 * 10^{-5} * 293})}\)

ni = 8.65 x \(10^9\) carriers/\(cm^3\)

Fraction of ionized atom = 8.65 x \(10^9\) / 5 x \(10^{22}\)

Fraction of ionized atom = 1.73 x \(10^{-13}\) atoms/\(cm^3\)

(d) For 75℃:

T = 75 + 273 = 348K

ni = \(5.4 * 10^{31} * 348^3 * e^{(\frac{-1.12}{8.62 * 10^{-5} * 348})}\)

ni = 3.724 x \(10^{11}\) carriers/\(cm^3\)

Fraction of ionized atom = 3.724 x \(10^{11}\) / 5 x \(10^{22}\)

Fraction of ionized atom = 7.449 x \(10^{-12}\) atoms/\(cm^3\)

(e) For 125℃:

T = 125 + 273 = 398K

ni = \(5.4 * 10^{31} * 398^3 * e^{(\frac{-1.12}{8.62 * 10^{-5} * 398})}\)

ni = 4.75 x \(10^{12}\) carriers/\(cm^3\)

Fraction of ionized atom = 4.75 x \(10^{12}\) / 5 x \(10^{22}\)

Fraction of ionized atom = 9.51 x \(10^{-11}\) atoms/\(cm^3\)

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Answer:

Mass is an extensive physical property, it depends on the amount of matter being measured. It is physical because it can be measured without changing a substance's chemical identity.

2.42 is the pH of a 0.10m solution of this acid that has been one-quarter neutralized.

To determine the pH of the 0.10M diprotic acid solution that has been one-quarter neutralized, follow these steps:

1. Calculate the concentration of the remaining unneutralized acid (HA): Since the solution has been one-quarter neutralized, 0.75 times the initial concentration remains:
  0.75 × 0.10M = 0.075M

2. Calculate the concentration of the produced conjugate base (A-): As one-quarter of the solution has been neutralized, one-quarter of the initial acid concentration has been converted to its conjugate base:
  0.25 × 0.10M = 0.025M

3. Use the given pKa1 value to find the Ka1 value:
  \(Ka_1\) = \(10^(^-^p^K^a^1^)\) = \(10^(^-^2^.^9^0^)\) = 1.26 × \(10^(^-^3^)\)
4. Write the acid dissociation equilibrium expression:
\(Ka_1\) = \([H^+][A^-] / [HA]\)

5. Substitute the concentrations and \(Ka_1\)value into the equilibrium expression, and solve for \([H^+]\) (the hydrogen ion concentration):
  1.26 × 10^(-3) = [H+](0.025) / (0.075)
 \([H^+]\) = 1.26 × \(10^(^-^3^)\)× (0.075) / (0.025) = 3.78 × \(10^(^-^3^)\)M

6. Calculate the pH of the solution:
  pH = -log10\(([H^+])\) = -log10(3.78 × \(10^(^-^3^))\) ≈ 2.42

So, the pH of the 0.10M diprotic acid solution that has been one-quarter neutralized is approximately 2.42.

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if the pka1 of a diprotic acid is 2.90, what is the pH of a 0.10m solution of this acid that has been one-quarter neutralized ?

Answer:

5.0

Explanation:

In order for a solute to dissolve in water the solute particles must be strongly attracted to water molecules.

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Answer:

The number of outermost energy level electrons ( valency electrons )

The atomic number

The benefits of using radiation as a medical tool are:

The risks of using radiation as a medical tool are:

Yes, I do think the professionals in the medical field are currently use radiation in the best way possible as it is used in the treatment of cancer and there has been amazing result.

Yes, I do think radiation should be used as a tool in the medical field because it is one that is often used in medical imaging procedures to detect a lot of health issues and also for treatment of diseases.

Therefore, based on the above, the benefits and risk listed above are correct.

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Answer:

C

Explanation:

It is c because that goes into heating and cooling and if nobody is home you should definetly turn off heating and cooling. This should be the correct answer.

Answer:

True, in as far as greater magnitude = greater power.

Answer:

correct

Explanation:

Answer:

\(412.8 \frac{gCaCl_2}{kg\ agua} \\\\29 \frac{gNaCl}{kg\ agua}\)

Explanation:

¡Hola!

En este caso, dado que se nos dieron las moles de cada sal por cada kilogramo de agua, es necesario para nosotros calcular los gramos por medio de la masa molar de estas, que son 110.98 g/mol y 58.44 g/mol respectivamente.

De este modo, realizamos las conversiones de moles a masa como se muestra a continuacion:

\(3.72\frac{molCaCl_2}{kg\ agua} *\frac{110.98gCaCl_2}{1molCaCl_2}=412.8 \frac{gCaCl_2}{kg\ agua} \\\\0.5\frac{molNaCl}{kg\ agua} *\frac{58.44gNaCl}{1molNaCl}=29 \frac{gNaCl}{kg\ agua}\)

¡Saludos!

Answer:

Liquid

Explanation:

Answer:

Helium and Neon have similar chemical properties because both of them completely fill the outer shell of their atoms' electrons, so there is nothing to share with other atoms, neither with the same element nor with any other element.

Explanation:  

Helium and Neon are both  noble gases . As elements react, their atoms, by losing, acquiring, or sharing electrons, complete their outer shells. Noble gas atoms already have full outer shells, so there is no tendency for them to lose, gain, or share electrons. There are incomplete outer shells of atoms of group 1 and 7 elements (so they are reactive)

Chemical properties of HELIUM and NEON -:

Hence, helium and neon have similar chemical properties as they are the most stable due to having the maximum number of valence electrons their outer shell can hold.

Answer:

I'm assuming you need to label above the lines. So, above the line where the  Cretaceous period ends is mass extinction and where the bracket lies is adaptive radiation.

Explanation:

Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.

The following is the introduction to a special e-publication called Determining the Age of the Earth (click the link to see a table of contents). Published earlier this year, the collection draws articles from the archives of Scientific American. In the collection, this introduction appears with the title, “Stumbling Toward an Understanding of Geologic Timescales.”